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94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
// Copyright (c) 2018-2020, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <type_traits>
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namespace
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{
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// credits to yrp (https://stackoverflow.com/questions/87372/check-if-a-class-has-a-member-function-of-a-given-signature
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template <typename T>
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struct HasCredits
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{
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template<typename U, uint64_t (U::*)> struct SFINAE {};
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template<typename U> static char Test(SFINAE<U, &U::credits>*);
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template<typename U> static int Test(...);
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static const bool Has = sizeof(Test<T>(0)) == sizeof(char);
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};
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}
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namespace tools
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{
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struct rpc_payment_state_t
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{
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uint64_t credits;
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uint64_t expected_spent;
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uint64_t discrepancy;
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std::string top_hash;
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bool stale;
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rpc_payment_state_t(): credits(0), expected_spent(0), discrepancy(0), stale(true) {}
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};
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static inline void check_rpc_cost(rpc_payment_state_t &rpc_payment_state, const char *call, uint64_t post_call_credits, uint64_t pre_call_credits, double expected_cost)
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{
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uint64_t expected_credits = (uint64_t)expected_cost;
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if (expected_credits == 0)
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expected_credits = 1;
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rpc_payment_state.credits = post_call_credits;
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rpc_payment_state.expected_spent += expected_credits;
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if (pre_call_credits <= post_call_credits)
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return;
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uint64_t cost = pre_call_credits - post_call_credits;
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if (cost == expected_credits)
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{
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MDEBUG("Call " << call << " cost " << cost << " credits");
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return;
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}
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MWARNING("Call " << call << " cost " << cost << " credits, expected " << expected_credits);
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if (cost > expected_credits)
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{
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uint64_t d = cost - expected_credits;
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if (rpc_payment_state.discrepancy > std::numeric_limits<uint64_t>::max() - d)
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{
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MERROR("Integer overflow in credit discrepancy calculation, setting to max");
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rpc_payment_state.discrepancy = std::numeric_limits<uint64_t>::max();
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}
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else
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{
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rpc_payment_state.discrepancy += d;
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}
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}
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}
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}
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